arch/mips/include/asm/mach-malta/mc146818rtc.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Carsten Langgaard, carstenl@mips.com
   4  * Copyright (C) 1999,2000 MIPS Technologies, Inc.  All rights reserved.
   5  * Copyright (C) 2003 by Ralf Baechle
   6  *
   7  * RTC routines for Malta style attached PIIX4 device, which contains a
   8  * Motorola MC146818A-compatible Real Time Clock.
   9  */
  10 #ifndef __ASM_MACH_MALTA_MC146818RTC_H
  11 #define __ASM_MACH_MALTA_MC146818RTC_H
  12
  13 #include <asm/io.h>
  14 #include <asm/mips-boards/generic.h>
  15 #include <asm/mips-boards/malta.h>
  16
  17 #define RTC_PORT(x)     (0x70 + (x))
  18 #define RTC_IRQ         8
  19
  20 static inline unsigned char CMOS_READ(unsigned long addr)
  21 {
  22         outb(addr, MALTA_RTC_ADR_REG);
  23         return inb(MALTA_RTC_DAT_REG);
  24 }
  25
  26 static inline void CMOS_WRITE(unsigned char data, unsigned long addr)
  27 {
  28         outb(addr, MALTA_RTC_ADR_REG);
  29         outb(data, MALTA_RTC_DAT_REG);
  30 }
  31
  32 #define RTC_ALWAYS_BCD  0
  33
  34 #define mc146818_decode_year(year) ((year) < 70 ? (year) + 2000 : (year) + 1900)
  35
  36 #endif /* __ASM_MACH_MALTA_MC146818RTC_H */